The Lemelson MIT Prize recognizes inventors whose designs improve lives. This year's winner, Ashok Gadgil, helped bring light to 100 million people in the developing world, designed fuel-efficient cook stoves and created a simple way to purify water.

The Lemelson MIT Prize recognizes inventors whose designs improve lives. This year's winner, Ashok Gadgil, helped bring light to 100 million people in the developing world, designed fuel-efficient cook stoves and created a simple way to purify water.

The Lemelson MIT Prize recognizes inventors whose designs improve lives. This year's winner, Ashok Gadgil, helped bring light to 100 million people in the developing world, designed fuel-efficient cook stoves and created a simple way to purify water.